In the OP, Travler only claimed correlation. I'm going to speculate here on possible causations of players with that type setup being better players. Of course, one is a statistical anomaly, which is always possible, but of no value in this conversation.
A direct causation would be players who play with an "optimal" setup will play better - as implied in the title of the thread.
A third possibility is that players with an excellent natural feeling for moving the racket and hitting the ball gravitate toward these racket setups because they feel more efficient and comfortable even if they could play just as well with another setup. At the very top of the tennis game the pros have an ability to sense things unconciously through their innate abilities and repetition. Maybe those with the best sense of tennis in general have the best sense of feeling how the racket moves through the air.